Swapping External Dependencies with Local Mocks Servers
Blog post from Postman
The text discusses the implementation of Postman Local Mock Servers to replace third-party API calls, specifically focusing on a train booking platform's Weather service that uses the OpenWeather API. By creating a local mock of the OpenWeather API, developers can avoid rate limits and costs associated with the API's usage, while ensuring consistent test scenarios, such as triggering a travel warning for snow in Edinburgh. The mock setup involves capturing real API requests using Postman, creating a mock that mirrors the request and response structure, and integrating it into the development environment via configuration settings. This approach not only facilitates predictable testing conditions but also enhances error handling by simulating real-world API responses like missing API keys or unknown cities. The same strategy can be applied to other services, such as payments or SMS notifications, to achieve deterministic testing outcomes without the overhead of third-party dependencies.
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